Improvement in dovetailing-machines



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Improvement in Do WM. 0. BRANCH, ms. A. H-ASELHNE, WALTER BRANCH, &CHAS. E BRANCH.

fly 7 "Z Ll UNrrn STA'rEs WILLIAM G. BRANCH, .I MEs A. HASELTINE,WALTERBR NCH, AND CHARLES r. BRANCH, or POMEROY, oHio.

IMPROVEMENT IN DOVETAlLlNG-MACHINES.

Specification forming part of Letters Patent No. 119,113, datedSeptember 19, 1871.

- To all whom it may concern:

i of this specification.

.The nature of 'our invention consists in the construction andarrangement of a machine for dovetailing wood, as will be hereinaftermore fully set forth.

In order to enable others skilled in the art to which our inventionappertains to make and use the same, we will now proceed to describe itsconstruction and operation, referring to the annexed drawing, in which-Figure 1 is a side view, andFig. 2 a plan view of our entire machine.Figs. 3, 4, 5, and 6 are views of thebits used; and Fig. 7 shows aportion of the frame.

A represents the frame-work for the support of the machinery. B B areboxes to hold the axle of the mandrel or drum from which the power isobtained. O G are corner boxes for the carriagetowork perpendicularlyin. The corner box es on one side are stationary, while those on theother side are attached to sliding crossbars A in the frame,and saidCI'OSSrbZLI'S adjusted by means of set-screws a a, so that in case ofwear of the upright slides supporting the carriageframe, they can bemoved inward and kept tight. D is the frame-work supporting thecarriageslides. E E are upright slides, working in the corner boxes 0 O,by which the carriage is raised and lowered perpendicularly. F isbrace-work supporting the carriage-frame above the spiralspring. A rod,b, passes perpendicularly from the center of theframe-work D through thebracework F and connectin g with the treadle, said rod being, below thebrace-work, surrounded by the spiral-spring d for the purpose ofelevating the bed-plate on which the material to be dovetailed rests,and'keeping it in position. G G are the stops for regulating the lengthof the dovetail.

H is a shaft in which the stops are shifted from one position toanother. I is a gauge for bringing the work square and causing samedepth of out throughout. J is the bed-plate or table on which thematerial to be dovetailed is placed. K is a stop on the under side ofthe table J, which, by contact with the stops G G, regulates the size(length) of the dovetail. L L are carriageslides on which the bed-platerests on carriage. M is the stationary flame-work on the table forholding the material in position, the material being held by the screw 6working in the nut f which slides in said frame. N is the treadle forlowering the bed-plate or table J. O is a screw for regulating the depthof cut of the dovetail. P is the mandrel or drum for holding the bits. RIt are the bits for cutting the dovetail. The bit It is straight, asshown in Fig. 3, with an opening cut through, and cuts what is termedthe pins of the dovetail; while the bit R has two concave sides, asshown in Fig. 5, and cuts the holes for the pins. q

The bits are placed in the mandrel, which is kept continually revolving.The wood to be dovetailed is placed upon the bed-plate upon thecarriage, and the end of the wood placed firmly against the guide Iabove the bit. The wood is then brought in contact with the bit by usingthe foot-lever or treadle N to lower until the carriage strikes thescrew 0, which is previously set for the depth required. The length isregulated by using the stops G G beneath thebed-plate, extending acrossthe framework, which can be opened or closed, and the distance betweenthese pins or stops gives the distance between the pins of thedovetails. After setting the screw for the depth and the stops for thedistance, and having wood placed upon the bed-plate, by the treadle itis brought to the depth desired. Then, by moving the carriage to and frountil it strikes the pins beneath, cut the corners round and form thepin of the dovetail, using the straight bit R. In using the other bit Bchange nothing, holding the carriage against the pin, and bring downwith the treadle, which causes the bit to cut through the Wood; thenmove the carriage until it strikes the next pin, and bring down again,and so on.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent, is

1. The arrangement of the frame-work 1), slides E E, brace-work F, rod1), spring (1, and treadle N, substantially as shown and described, andfor the purposes herein set forth.

2. In combination with the frame D provided with slides E E and operatedby means of the treadle N, rod b, and spring d, the corner boxes C O forguiding the slides E E, when said corner boxes are arrangedsubstantially as shown and described, so that they may be adjusted tocompensate for wear, as herein set forth.

3. The table J provided with stop K, in combination with the adjustablestops G G, frame M, sliding-nut f, screw 0, adjustable gauge I, and

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